<!DOCTYPE html>
<html lang="zh">
<head>
  <meta charset="UTF-8">
  <title>{% block title %}{% endblock %}</title>
  <!--bootstrap css js  ,jquery-->
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
  <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
  <script src="https://cdn.bootcss.com/twitter-bootstrap/4.1.3/js/bootstrap.js"></script>


</head>
<body>
{% block content %}
{% endblock %}
</body>
</html>